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DC Motors

DC Motors
A dc motor can be easily identified by

Size of conductor
Yoke
Commutator
Winding

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DC Motors
The torque developed by a dc motor is directly proportional to

Armature resistance × applied voltage
None of the listed here
Armature resistance × armature current
Flux per pole × armature current

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DC Motors
During rheostat braking of dc series motor

Motor is run at reduced speed
Motor is run as a generator
None of the listed here
Motor is reversed in direction

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DC Motors
D.C. series motors are used

Where constant operating speed is needed
Where load changes frequently
None of these
Where load is constant

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DC Motors
The shaft torque in a dc motor is less than total armature torque because of ______ in the motor.

None of the listed here
Field losses
Iron and friction losses
Cu losses

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DC Motors
In a D.C. generator, the iron losses mainly take place in

Armature conductors
Commutator
Armature rotor
Yoke

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